Accessing a variable wich is in another script C#

Question

Main.cs

 public class Main : MonoBehaviour {
     public int a = new int();
     // Use this for initialization
     void Start () {
         a = 0;
     }

void Update () { a++; if(a>20) { a = 0; }

 }
 }

Program.cs

 public class Balls : MonoBehaviour {
     public int num;
     public int s;
     // Use this for initialization
     void Start () {
         Renderer rend = GetComponent<Renderer>();
 
        // rend.material.shader = Shader.Find("Specular");
         num = System.Convert.ToInt32(GetComponent<SpriteRenderer>().name);
         Debug.Log(num);
 
         s = 0;
 
     }
     public int c=0;
     // Update is called once per frame
     void Update ()
     {
        c = Main.a;
         if (num == c)
         {
             GetComponent<SpriteRenderer>().color = Color.red;
         }
         else
         {
             GetComponent<SpriteRenderer>().color = Color.white;
         }
  
     }
 
 
 }

I tried every way that told in forums but i take same error

Object Reference Not Set To An Instance Of An Object

Thank You for your helps...

Answer 1

Best Answer

Answer by Woltus · Jun 26, 2017 at 01:12 PM

If your Main may be something like GameManager, You can use static variable or singleton:

 public class Main : MonoBehaviour {
 public static Main instance = null;
 
 void Awake() {
     if (instance == null) instance = this;
     else if (instance != this) Destroy(gameObject); 
 
     DontDestroyOnLoad(gameObject);
 }
 
 public int a = new int();
 void Start () {
      a = 0;
      }
 }

Then You can access variables in Main by:

 c = Main.instance.a;

If Main is just an gameObject like any else then You need to store reference to this script in another one:

 public class Balls : MonoBehaviour {
      public int num;
      public int s;
      public Main main;
 ...

 void Update ()
 {
      c = main.a;
 ...

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mucan54 · Jun 26, 2017 at 03:12 PM 0

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Same error Object Reference Not Set To An Instance Of An Object

Edit: Worked

Answer 2

Answer by cbjunior · Jun 26, 2017 at 11:57 AM

Change the line public int a = new int (); to public static int a;

Because you're not declaring an instance of Main to hold the a variable, you need to make it static.

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Accessing a variable wich is in another script C#

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